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Earth's global temperature has been rising gradually over the last decades, but the warming has not been the same everywhere. Scientists are therefore trying to pin down how the warming has affected regional climates because that is what really matters to people, and to adaptation and mitigation strategies. Their efforts, however, had hit a roadblock because the necessary observations of the winds over the oceans were biased.
This graphic shows changes over the last 60 years in the August marine-cloudiness and land-rainfall over the tropical Atlantic. Yellow to dark red indicates more cloudiness/rainfall; light blue to gray, less cloudiness/rainfall. Over land, dark red = 40 mm/month more rain, and grey = 40 mm/month less rain. Note the significant increase in rainfall on the Guinea Coast. (Credit: Hiroki Tokinaga, IPRC/SOEST/UHM)